METHOD OF EVALUATING THE TECHNICAL STATE OF MACHINES AND MECHANISMS AGAINST PARAMETERS OF WEAR PARTICLES Russian patent published in 2018 - IPC G01N23/223 

FIELD: measuring technology; engines and pumps.

SUBSTANCE: invention relates to methods for determining technical state of engines, machines and mechanisms against characteristics of metal wear particles found in lubricating oils, fuels and special liquids. Claimed method of evaluating the technical state of machines and mechanisms against parameters of the wear particles includes sampling, preliminary preparation of sample by means of thorough mix of the selected washout from the main filter and divided into two parts. First part is analyzed on a scintillation analyzer, and the second part of the sample is further analyzed by an X-ray fluorescence analyzer with polycapillary optics, the information from both instruments is recorded in a database, which compares the level of the measured parameters with the parameters of the statistical reference model of the serviceable engine, identifies the diagnostic features of the defect and provides information for making a diagnostic decision about the further operation of the engine. Additionally, the fraction of large particles in the washout sample is estimated, for which the prepared flushing sample is divided into two parts, first part is analyzed on a scintillation analyzer, and the second, in order to determine the contribution of large particles, is screened through a mesh screen, obtaining two fractions of the sample +S and -S, where S is the size of the sieve cells, +S fraction and -S fraction are planted on the "Vladipor" membrane filters and X-ray fluorescence measurements of the integral intensities of the base element lines in both fractions are performed. Then take the ratio of the intensity of the elements of the fraction +S to the intensity of the corresponding elements of the fraction -S, estimating the mass contribution of the fraction with large particles by formula k=I+_S/L_S, and depending on the ratio of the intensity ratio, additional analysis is carried out. Size of the sieve cells is taken in the range of 60–80 mcm. At a ratio of the intensity ratio the decision on the technical condition of the engine is taken only against the scintillation measurements results, if the ratio of the intensity ratio , x-ray fluorescence measurements of the elemental composition of coarse particles (fraction +80 mcm) Decision on technical condition of engine is made taking into account these additional measurements.

EFFECT: increase in the reliability of diagnosis by measuring the parameters of the wear particles accumulated on the filter elements of the main oil filter and evaluating the contribution of large particles to the flushing sample.

3 cl, 3 tbl